Enable Or Disable Extension Loading

int sqlite3_enable_load_extension(sqlite3 *db, int onoff);

So as not to open security holes in older applications that are unprepared to deal with extension loading, and as a means of disabling extension loading while evaluating user-entered SQL, the following API is provided to turn the sqlite3_load_extension() mechanism on and off.

Extension loading is off by default. See ticket #1863. Call the sqlite3_enable_load_extension() routine with onoff==1 to turn extension loading on and call it with onoff==0 to turn it back off again.

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